Replaces everything after the enacting clause. Amends the Illinois Insurance Code. Provides that a treatment that is administered or prescribed for pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections and pediatric acute onset neuropsychiatric syndrome after July 18, 2017 shall be covered. Provides that for billing and diagnosis purposes, pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections and pediatric acute onset neuropsychiatric syndrome shall be coded as autoimmune encephalitis until a code is assigned. Provides that coverage for treatment of pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections and pediatric acute onset neuropsychiatric syndrome may not be denied due to a diagnosis of autoimmune encephalopathy or autoimmune encephalitis. Effective immediately.